Add ability to filter `myip` by CIDR
Add ability to filter `myip` by CIDR

E.g.:

```
myip               => 10.30.30.42
myip 172.17.0.0/16 => 172.17.42.1
myip -6            => fe80::eab1:fcff:fe02:c4c5
myip -x            => 74.111.1.1
myip 127           => 127.0.0.1
```

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